Ball Lightning is a rare Creature — Elemental card from World Championship Decks 1998 (WC98), collector number br210. Current market price: $3.78, TCGplayer market prices via Scryfall.
Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.) Haste (This creature can attack and {T} as soon as it comes under your control.) At the beginning of the end step, sacrifice this creature.